The Roman resettled barbarian tribes inside the empire and took their weapons. When the Romans started treating them as scum the barbarians rearmed themselves and the revolt was on. The Romans lost Legions because of it. Books on cops have been written in the U.S. referring to the cops as the Praetorian Guard. The weapons are slightly different but the people are the same. On some metaphysical level you could call it reincarnation thru time. lol